75566811
Oct 8, 1998
Dec 25, 2001
OPTICAL APPARATUS, NAMELY, FLIGHT SIMULATOR SCREENS; VISUAL DISPLAY SYSTEMS COMPRISED OF SCREENS, PROJECTORS, POLARIZERS, SPHERICAL BEAM SPLITTERS, AND BI-REFRIGENTS FOR PRODUCING A SIMULATED IMAGE; VISUAL DISPLAY SYSTEMS COMPRISED OF FOCUSING OPTICS FOR PRESENTING AN IMAGE OF AN OBJECT AT A DISTANCE
Electrical and Scientific Apparatus